Yes indeed, Graham, one can find tons of infos as well as breathtaking
reports on Svend's website.
Isn't it fascinating, folks, how much such a stone can tell us not only from
his very beginning, but also from his hot ride through the atmosphere? I
must confess that I am always anew surprised and excited about that.
Best - Matthias
----- Original Message -----
From: "Graham Ensor" <[email protected]>
To: "Steve Witt" <[email protected]>
Cc: <[email protected]>; "Martin Altmann"
<[email protected]>
Sent: Wednesday, May 29, 2013 9:51 AM
Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was: Two
special Chelyabinsk individualswith Brown Lee-side Crust - color-oriented!)
Hi All....Svend has an explanation for this brown crust on his
excellent website....from several years back.
http://www.niger-meteorite-recon.de/en/Meteorite_fusion_crust_2.htm
Cheers,
Graham
On Tue, May 28, 2013 at 9:58 PM, Steve Witt <[email protected]> wrote:
Martin, Fred and all,
I just got in some of the new meteorite from Mauritania showing the same
thing. No black lipping, but brown crust on the back side of a fresh
stone.
Front: http://www.flickr.com/photos/stevewitt/8870872109/
Back: http://www.flickr.com/photos/stevewitt/8870872297/
Steve Witt
IMCA #9020
http://imca.cc/
________________________________
From: Martin Altmann <[email protected]>
To: [email protected]
Sent: Monday, May 27, 2013 4:03 PM
Subject: Re: [meteorite-list] (House-AD): ORANGE fresh Chelyabinsk (was:
Two special Chelyabinsk individualswith Brown Lee-side Crust -
color-oriented!)
Hi Fred,
Exactly and Wow!
With your Bensour it seems that just the same had happened!
Has also the black rim!
My guess at the time I got it, was simply a matter of primary fusion crust
(the brownish one) and secondary fusion crust >(the darker one). Could it
be
a matter of altitude where it was formed? Speed & temperature of
fusion?...
There we definitely have to ask our experts of aerodynamics and chemistry
here.
To me it's evident, because the black crust lips over the brown one, that
that brown on the back must have been formed before the crust on the apex.
There are going things in flight on the back of the stones.... remember
the
Tamdakht-Couscous or the 12.5kg-flat heat-shield, which had also such
fragments incorporated in the skin..
Now these color-crusts with Chelyabinsk (and Tissint).
Here, look, our most shocking example!
Is something for Jan, Menno or Rob,
Because half of the stone is almost: ORANGE!
Has 63.55g
These sides are normal:
http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_01.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_02.JPG
But look at that!
http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_03.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_04.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_63_55_g_05.JPG
Hmm, shall we sell it too?
O.k....
:-)
Your Meteorite House
Von: Meteoriteshow [mailto:[email protected]]
Gesendet: Montag, 27. Mai 2013 17:32
An: 'Martin Altmann'; [email protected]
Betreff: RE: [meteorite-list] (House-AD): Two special Chelyabinsk
individualswith Brown Lee-side Crust - color-oriented!
Hi All again,
It seems that my link didn't work; let me try again, actually I have
several
pictures:
http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(1).jpg
http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(7).jpg
http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(6).jpg
http://meteoriteshow.free.fr/images/for_sale/July_2007/Benguerir/benguerir-7
9.6g(3).jpg
Cheers
Fred
www.meteoriteshow.com
IMCA #2491
-----Message d'origine-----
De : [email protected]
[mailto:[email protected]] De la part de Martin
Altmann
Envoyé : lundi 27 mai 2013 14:26
À : [email protected]
Objet : [meteorite-list] (House-AD): Two special Chelyabinsk
individualswith
Brown Lee-side Crust - color-oriented!
Importance : Haute
Hello there,
we have to share with you a pretty exciting observation.
It was here already on the list, that some of you found on the first-pick
Chelyabinskis places with a brownish, nevertheless fresh fusion crust.
That
phenomenon btw. you had sometimes also on a few Tissints, there the brown
crust was even translucent (were horribly difficult to sell, because
people
watching the photos were skeptical, thought, they wouldn't be fresh, but
weathered - and that, where no iron is present in Tissint to rust).
Many of you blossomed during the last 3 months into true
Chelyabinsk-experts,
so please, pay attention to those two individuals and tell us your
opinion:
75.45g
http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_01.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_02.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_03.JPG
68.37g
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_01.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_02.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_03.JPG
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_04.JPG
Well, baffling, aren't they?
Both of them have a side, and ONLY one side, which is fully coated by the
brown crust,
while all other sides are black, as usual.
Here:
http://www.meteoritenhaus.de/img/Chelyabinsk_68_37_g_02.JPG
And here:
http://www.meteoritenhaus.de/img/Chelyabinsk_75_45_g_02.JPG
And you see, that the brown-side is framed all around by a lipping, which
is
black,
hence most would therefore say, only because of the rollover-lip, that the
stones are flight-oriented.
At least one can say, by means of the circular lipping around the edges,
that the stones had for a longer time a stable position in flight.
And that the brown side is the backside, the lee-side.
And what is striking, is, that the lipping overlaps the brown crust, hence
the brown crust must have formed simultaneously, while the front surface
was
melting.
Now one could speculate, what could have caused that different crust -
from
the chip missing in one of the stones, we see that the material beneath
the
brown crust isn't special (anyway, on the sides the fusion crust for the
same material is black).
Thus maybe the different color could stem from a lack of oxygen, when it
melted, on the lee-side of the stone in flight, where one has a low
pressure/partial vacuum?
We think, one could even speak of a new category of orientation:
COLOR-ORIENTED!
Well, if you like to have them, what shall we do with so special
specimens...
Let's make 20$/g to be among the very cheapest Chelyabinsk-offerers,
+ 50cents for the lipping, where others would scream: oriented, oriented!
+ 1.5$/g for the fantastic "color-orientation"...
Makes 22$/g.
Fascinating, aren't they?
Your Meteorite House Team
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